MIL-DTL-17111E
3.2.4.2 Rust prevention. The transmission fluid shall prevent the formation of rust.
3.2.4.3 Corrosion and oxidation stability. The finished fluid must encompass both
resistance to oxidation and protection of metal parts against corrosion.
3.2.4.3.1 336 hour test. Following the 336 hour test of 4.5.3.4.1, the material will meet
the following requirements.
3.2.4.3.1.1 Corrosion. The total loss in weight of the copper when subjected to the action of
the finished fluid for 336 hours shall not be greater than 0.2 milligrams (mg) per square centimeter
(cm) of the total surface. There shall be no pitting, etching, or visible signs of corrosion on the
surface of any of the specimens when viewed under magnification of 20 diameters. Slight
discoloration of the surface of the copper will be permitted.
3.2.4.3.1.2 Resistance to oxidation. The percentage change in kinematic viscosity at
99 °C and -18 °C shall be within range of 0 to 25 percent of the viscosity of the original fluid and
the neutralization number shall not be greater that 0.5 after the 336 hour test. The amount of oil-
insoluble material remaining after the test shall not be greater than 0.5 weight percent of the
original quantity of fluid used in the test. The color of the fluid after tests shall not be darker
than color 5.0 when tested in accordance with ASTM D1500.
3.2.4.3.2 Test duration of 72 hours. The percentage change in kinematic viscosity of the
fluid at 99 °C and -18 °C shall be within the range of 0 to 15 percent of the viscosity of the original
fluid. The neutralization number of the fluid shall not be greater than 0.5 after the test. The acidity
of the water layer shall not be greater than 0.5 mg of potassium hydroxide per gram of water, using
bromothymol blue as the indicator.
3.2.4.4 Shear stability. The viscosity change of the hydraulic fluid measured in mm2/s at
38 °C shall not be more than 5 percent greater than the percentage change of the shear stability
reference fluid, nor shall the neutralization number have increased by more than 0.20 over the
original neutralization number.
3.2.4.5 Steel-on-steel wear. The average wear scar shall not be more than 1 millimeter (mm)
in diameter.
3.2.4.6 Evaporation. For 6 hours at 66 °C, the loss due to evaporation shall not exceed
20 percent.
3.2.4.7 Water sludging. The viscosity of the emulsion formed after standing undisturbed
for 24 hours at 38 °C shall be within the range of 2 to 10 percent of the original 38 °C kinematic
viscosity of the fluid.
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